I'm guessing you don't have / haven't built the kit yet? The kit comes with a 17t pinion (and a 23) which gives you 10.9 overall ratio. I am running a 14x2 indoors on a 21t which is 8.8 overall - probably a bit high for a 10 turn.
The 17T should be a decent start at 10.9 overall though.
I've mostly run brushless in my 501X but when I've run brushed I've run around 11.1 overall on a 12x1 - maybe a bit conservative but it was indoors.
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